The food composition consisted of eight groups: diatom, protozoa, spongiaria, annelida, mollusca,crustacea, echinodermata and pisces.

• 其食物组成有8大类：硅藻类、原生动物、海绵动物、环节动物、软体动物、甲壳动物、棘皮动物及鱼类。